Improvement in liquid slating for forming black-boards



dialled glam WILLIAM WI DUDLEY, OF

O ENTREVILLE, IN DIANA;

Letters Patent No. 106,923, dated August 30, 1870.

IMPROVEMENT IN LIQUID SLATING- FOR FORMING- BLACK-BOARDS, 8m.

The Schedule referred to in these Letters Pafent and making pa t f th same To all whom. it may concern Be it known that I, WILLIAM W. DUDLEY, of Oentreville, in the county of Wayne and State of Indiana, have invented a certain Compound called Liquid Slating, to be used for coating or slating blackboards, and for other similar purposes.

The nature ofthis invention consists in compounding alcohol, shellac, pulverized pumice stone, ironblack, lamp-black, manganese, and chrome-green, to form a liquid for coattng or slating black-boards, and for other purposes. I

To prepare this liquid slating, take about one gallon of alcohol to dissolve one and a quarter pounds of orange shellac, and mix two parts of this solution with one part of a compound prepared by the admixture of about one and a halt pounds of pulverized pinnice-stone; one and a half pounds of ivroy-blacky tln'ee-quarters of a pound of best lamp-black two ounces of manganese; four ounces of dark chrome green with a suificient quantity of alcohol, say about one-halt gallon, to give it the consistency of paste.

The combination, in about the proportions stated, forms the liquid slatiug ready for use.

It will be found that it possesses qualities far superior to any substance for similar purposes now in use, giving to the surface to which it may be applied, a

dead-black color, non-reflective, so that characters written or marked upon a board or wall coated with it may be seen with distinctuess from any point in a room regardless of the angle at which the light may strike such surface. It makes as smooth a surface as the best natural slate, and its smoothness is not easily impaired, whether writing upon it with chalk, crayon,

or slate=pencil; nor will it peel off by reason of exposure or after using it for some time.

It is applicable to pasteboard to form an elastic slate, and can, in that form, he used for'a great variety of purposes, which will readily suggest themselves to'any one skilled in the art.

What I claim as my invention, and desire to secure by Letters Patent, is-q The manufacture or preparation of'a compound, which is denominated liquid slating, of theingredients in subsiantiallythe proportions, and for the purposes set forth.

In testimony whereof I have signed my name to this sp dlfication in the presence of two subscribing witn es.

WILLIAM W. DUDLEY. Witnesses WM. H. LYNDE, HENRY 0'. Fox. 

